I have no experience with the ox locker at all. But, I did have an ARB before I went to one ton's. My front leaked, and the ARB compressor run the whole time I had it engaged, but it never failed to lock in. I didn't have a reservoir at all, just straight to the compressor.
There are many alternatives to the ARB compressor. It is weak, and by it's self it takes a long time to pump up a tire.
A stock AC compressor will do the job a long with a reservoir tank. What ever come stock on your engine will work. Some better than others, but using what come on it makes brackets and such a lot easier.
The better electric compressors will work also. A tank is recommended.
I have seen some folks run a Co2 tank to power it.
I know mid 80's full size GM wagons had what was called levelers. Basically a compressor that pumped up air shocks. Looks very similar to an ARB compressor and if found at a auto salvage yard can be had cheap.
